 /*******************************************************************************
  * Copyright (c) 2000, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.forms.widgets;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.PaintEvent;
 import org.eclipse.swt.graphics.*;
 import org.eclipse.swt.widgets.Composite;
 /**
  * A custom selectable control that can be used to control areas that can be
  * expanded or collapsed. The control control can be toggled between selected
  * and deselected state with a mouse or by pressing 'Enter' while the control
  * has focus.
  * <p>
  * The control is rendered as box with a '+' or '-' sign, depending on the
  * expansion state. Focus indication is rendered around the box when the
  * control has keyboard focus.
  *
  * @see Twistie
  * @since 3.0
  */
 public class TreeNode extends ToggleHyperlink {
     /**
      * Creates a control in a provided composite.
      *
      * @param parent
      * the parent
      * @param style
      * the style
      */
     public TreeNode(Composite parent, int style) {
         super(parent, style);
         innerWidth = 10;
         innerHeight = 10;
     }
     protected void paint(PaintEvent e) {
         paintHyperlink(e.gc);
     }
     protected void paintHyperlink(GC gc) {
         Rectangle box = getBoxBounds(gc);
         gc.setForeground(getDisplay().getSystemColor(
                 SWT.COLOR_WIDGET_NORMAL_SHADOW));
         gc.drawRectangle(box);
         gc.setForeground(getForeground());
         gc.drawLine(box.x + 2, box.y + 4, box.x + 6, box.y + 4);
         if (!isExpanded()) {
             gc.drawLine(box.x + 4, box.y + 2, box.x + 4, box.y + 6);
         }
         if (paintFocus && getSelection()) {
             gc.setForeground(getForeground());
             gc.drawFocus(box.x - 1, box.y - 1, box.width + 3, box.height + 3);
         }
     }
     private Rectangle getBoxBounds(GC gc) {
         int x = 1;
         int y = 0;
         gc.setFont(getFont());
         //int height = gc.getFontMetrics().getHeight();
 //y = height / 2 - 4;
 //y = Math.max(y, 0);
 y = 2;
         return new Rectangle(x, y, 8, 8);
     }
 }

